The problems of Spain, Italy, and Greece are often pointed to as being somehow bleeding-edge, canaries in the coalmine that serve as warnings to other governments of what might happen if they don't get their acts together.

But the real story today is just the opposite. The world is experiencing whatever the reverse of a sovereign debt crisis is, as borrowing costs for government are plummeting EVERYWHERE. . .

What this essentially means is that there's a lot of money out there that sees no productive investments in the real world, and thus people are willing to stick it with entities that promise them a very meager return.

As government yields hit zero or lower, conventional economic realities fall apart. Jonathan Portes has written about the possibility of financing a £30bn infrastructure program using just the income brought in by the now-defunct pasty tax, while Matt Yglesias has argued – frequently – that when real interest rates are negative, it simply makes no sense to collect taxes.

ADAM LASHINSKY (Moderator): You have $50 billion at Google, why don't you spend it on doing more in tech, or are you out of ideas? And I think Google does more than most companies. You're trying to do things with self-driving cars and supposedly with asteroid mining, although maybe that's just part of the propaganda ministry. And you're doing more than Microsoft, or Apple, or a lot of these other companies. Amazon is the only one, in my mind, of the big tech companies that's actually reinvesting all its money, that has enough of a vision of the future that they're actually able to reinvest all their profits.

ERIC SCHMIDT: They make less profit than Google does.

PETER THIEL: But, if we're living in an accelerating technological world, and you have zero percent interest rates in the background, you should be able to invest all of your money in things that will return it many times over, and the fact that you're out of ideas, maybe it's a political problem, the government has outlawed things. But, it still is a problem. . .

ERIC SCHMIDT: What you discover in running these companies is that there are limits that are not cash. There are limits of recruiting, limits of real estate, regulatory limits as Peter points out. There are many, many such limits. And anything that we can do to reduce those limits is a good idea.

PETER THIEL: But, then the intellectually honest thing to do would be to say that Google is no longer a technology company, that it's basically – it's a search engine. The search technology was developed a decade ago. It's a bet that there will be no one else who will come up with a better search technology. So, you invest in Google, because you're betting against technological innovation in search. And it's like a bank that generates enormous cash flows every year, but you can't issue a dividend, because the day you take that $30 billion and send it back to people you're admitting that you're no longer a technology company. That's why Microsoft can't return its money. That's why all these companies are building up hordes of cash, because they don't know what to do with it, but they don't want to admit they're no longer tech companies.

What we are seeing is two sides of the same coin. When companies like Google – which, as Lashinsky says, is one of the biggest fans of blue-sky innovation in Silicon Valley – can't find anything to spend their war chests on, then they have to keep them somewhere. Banks are, for the first time in a generation, perceived as risky, so they turn to sovereigns, thus driving yields even lower.

The problem is, since these companies are looking for safety rather than income, yields have a lot further to fall. How much will Google pay for a safe place to keep its money? We don't know. But it's likely to be a lot more than a measly 0.3 per cent.